ref: 4df77191c3b7d1c09255c9aaf0e159f7af20902d
dir: /tr.c/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "xroff.h"
static int tr_nl = 1;
/* skip everything until the end of line */
static void jmp_eol(void)
{
int c;
do {
c = cp_next();
} while (c >= 0 && c != '\n');
}
static void tr_ll(char **args)
{
if (args[1])
n_l = eval(args[1], n_l, 'm');
}
static void tr_vs(char **args)
{
if (args[1])
n_v = eval(args[1], n_v, 'p');
}
static void tr_pl(char **args)
{
if (args[1])
n_p = eval(args[1], n_p, 'v');
}
static void tr_nr(char **args)
{
int id;
if (!args[2])
return;
id = REG(args[1][0], args[1][1]);
*nreg(id) = eval(args[2], *nreg(id), 'u');
}
static void tr_ds(char **args)
{
if (!args[2])
return;
str_set(REG(args[1][0], args[1][1]), args[2]);
}
static void tr_as(char **args)
{
int reg;
char *s1, *s2, *s;
if (!args[2])
return;
reg = REG(args[1][0], args[1][1]);
s1 = str_get(reg) ? str_get(reg) : "";
s2 = args[2];
s = malloc(strlen(s1) + strlen(s2) + 1);
strcpy(s, s1);
strcat(s, s2);
str_set(reg, s);
free(s);
}
static void tr_rm(char **args)
{
if (!args[1])
return;
str_rm(REG(args[1][0], args[1][1]));
}
static void tr_rn(char **args)
{
if (!args[2])
return;
str_rn(REG(args[1][0], args[1][1]), REG(args[2][0], args[2][1]));
}
static char *arg_regname(char *s, int len);
static void tr_de(char **args)
{
struct sbuf sbuf;
char buf[4];
int end[4] = {'.'};
int id, c, i;
if (!args[1])
return;
if (args[2]) {
end[0] = args[2][0];
end[1] = args[2][1];
}
id = REG(args[1][0], args[1][1]);
sbuf_init(&sbuf);
if (args[0][1] == 'a' && args[0][2] == 'm' && str_get(id))
sbuf_append(&sbuf, str_get(id));
while ((c = cp_next()) >= 0) {
sbuf_add(&sbuf, c);
if (c == '\n') {
c = cp_next();
if (c == '.') {
arg_regname(buf, 4);
if (buf[0] == end[0] && buf[1] == end[1]) {
jmp_eol();
break;
}
sbuf_add(&sbuf, '.');
for (i = 0; buf[i]; i++)
sbuf_add(&sbuf, (unsigned char) buf[i]);
} else {
if (c >= 0)
sbuf_add(&sbuf, c);
}
}
}
str_set(id, sbuf_buf(&sbuf));
sbuf_done(&sbuf);
}
/* read into sbuf until stop */
static void read_until(struct sbuf *sbuf, int stop)
{
int c;
while ((c = cp_next()) >= 0) {
if (c == stop)
return;
if (c == '\n') {
cp_back(c);
return;
}
sbuf_add(sbuf, c);
}
}
/* evaluate .if strcmp (i.e. 'str'str') */
static int if_strcmp(void)
{
struct sbuf s1, s2;
int ret;
sbuf_init(&s1);
sbuf_init(&s2);
read_until(&s1, '\'');
read_until(&s2, '\'');
ret = !strcmp(sbuf_buf(&s1), sbuf_buf(&s2));
sbuf_done(&s1);
sbuf_done(&s2);
return ret;
}
/* evaluate .if condition */
static int if_cond(void)
{
struct sbuf sbuf;
char *s;
int ret;
sbuf_init(&sbuf);
read_until(&sbuf, ' ');
s = sbuf_buf(&sbuf);
if (s[0] == 'o' && s[1] == '\0')
ret = n_pg % 2;
else if (s[0] == 'e' && s[1] == '\0')
ret = !(n_pg % 2);
else if (s[0] == 't' && s[1] == '\0')
ret = 1;
else if (s[0] == 'n' && s[1] == '\0')
ret = 0;
else
ret = eval(s, 0, '\0') > 0;
sbuf_done(&sbuf);
return ret;
}
/* execute or skip the line or block following .if */
static void if_blk(int doexec)
{
int c;
if (doexec) {
do {
c = cp_next();
} while (c == ' ');
cp_back(c);
} else {
cp_skip();
}
}
static int ie_cond[NIES]; /* .ie condition stack */
static int ie_depth;
static void tr_if(char **args)
{
int neg = 0;
int ret;
int c;
do {
c = cp_next();
} while (c == ' ' || c == '\t');
if (c == '!') {
neg = 1;
c = cp_next();
}
if (c == '\'') {
ret = if_strcmp();
} else {
cp_back(c);
ret = if_cond();
}
if (args[0][1] == 'i' && args[0][2] == 'e') /* .ie command */
if (ie_depth < NIES)
ie_cond[ie_depth++] = ret != neg;
if_blk(ret != neg);
}
static void tr_el(char **args)
{
if_blk(ie_depth > 0 ? !ie_cond[--ie_depth] : 0);
}
static void tr_na(char **args)
{
n_j = 0;
}
static char *arg_regname(char *s, int len)
{
char *e = s + 2;
int c;
while ((c = cp_next()) == ' ')
;
while (s < e && c >= 0 && c != ' ' && c != '\n') {
*s++ = c;
c = cp_next();
}
if (c >= 0)
cp_back(c);
*s++ = '\0';
return s;
}
static char *arg_normal(char *s, int len)
{
char *e = s + len - 1;
int quoted = 0;
int c;
while ((c = cp_next()) == ' ')
;
if (c == '"') {
quoted = 1;
c = cp_next();
}
while (s < e && c > 0 && c != '\n') {
if (!quoted && c == ' ')
break;
if (quoted && c == '"') {
c = cp_next();
if (c != '"')
break;
}
*s++ = c;
c = cp_next();
}
if (c >= 0)
cp_back(c);
*s++ = '\0';
return s;
}
static char *arg_string(char *s, int len)
{
char *e = s + len - 1;
int c;
while ((c = cp_next()) == ' ')
;
if (c == '"')
c = cp_next();
while (s < e && c > 0 && c != '\n') {
*s++ = c;
c = cp_next();
}
*s++ = '\0';
if (c >= 0)
cp_back(c);
return s;
}
/* read macro arguments */
static int mkargs(char **args, char *buf, int len)
{
char *s = buf;
char *e = buf + len - 1;
int c;
int n = 0;
while (n < NARGS) {
c = cp_next();
if (c < 0 || c == '\n')
return n;
cp_back(c);
args[n++] = s;
s = arg_normal(s, e - s);
}
jmp_eol();
return n;
}
/* read arguments for .ds */
static int mkargs_ds(char **args, char *buf, int len)
{
char *s = buf;
char *e = buf + len - 1;
int c;
args[0] = s;
s = arg_regname(s, e - s);
args[1] = s;
s = arg_string(s, e - s);
c = cp_next();
if (c >= 0 && c != '\n')
jmp_eol();
return 2;
}
/* read arguments for commands .nr that expect a register name */
static int mkargs_reg1(char **args, char *buf, int len)
{
char *s = buf;
char *e = buf + len - 1;
args[0] = s;
s = arg_regname(s, e - s);
return mkargs(args + 1, s, e - s) + 1;
}
/* do not read arguments; for .if, .ie and .el */
static int mkargs_null(char **args, char *buf, int len)
{
return 0;
}
static struct cmd {
char *id;
void (*f)(char **args);
int (*args)(char **args, char *buf, int len);
} cmds[] = {
{DIV_BEG + 1, tr_divbeg},
{DIV_END + 1, tr_divend},
{"am", tr_de, mkargs_reg1},
{"as", tr_as, mkargs_ds},
{"bp", tr_bp},
{"br", tr_br},
{"ch", tr_ch},
{"da", tr_di},
{"de", tr_de, mkargs_reg1},
{"di", tr_di},
{"ds", tr_ds, mkargs_ds},
{"dt", tr_dt},
{"el", tr_el, mkargs_null},
{"ev", tr_ev},
{"fi", tr_fi},
{"fp", tr_fp},
{"ft", tr_ft},
{"ie", tr_if, mkargs_null},
{"if", tr_if, mkargs_null},
{"in", tr_in},
{"ll", tr_ll},
{"na", tr_na},
{"ne", tr_ne},
{"nf", tr_nf},
{"nr", tr_nr, mkargs_reg1},
{"pl", tr_pl},
{"ps", tr_ps},
{"rm", tr_rm},
{"rn", tr_rn},
{"sp", tr_sp},
{"vs", tr_vs},
{"wh", tr_wh},
};
int tr_next(void)
{
int c = cp_next();
int nl = c == '\n';
char *args[NARGS + 3] = {NULL};
char cmd[RLEN];
char buf[LNLEN];
struct cmd *req;
while (tr_nl && (c == '.' || c == '\'')) {
nl = 1;
memset(args, 0, sizeof(args));
args[0] = cmd;
cmd[0] = c;
req = NULL;
arg_regname(cmd + 1, sizeof(cmd) - 1);
req = str_dget(REG(cmd[1], cmd[2]));
if (req) {
if (req->args)
req->args(args + 1, buf, sizeof(buf));
else
mkargs(args + 1, buf, sizeof(buf));
req->f(args);
} else {
mkargs(args + 1, buf, sizeof(buf));
if (str_get(REG(cmd[1], cmd[2])))
in_push(str_get(REG(cmd[1], cmd[2])), args + 1);
}
c = cp_next();
}
tr_nl = nl;
return c;
}
void tr_init(void)
{
int i;
for (i = 0; i < LEN(cmds); i++)
str_dset(REG(cmds[i].id[0], cmds[i].id[1]), &cmds[i]);
}